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/*
Arduino Starter Kit example
Project 15 - Hacking Buttons
This sketch is written to accompany Project 15 in the Arduino Starter Kit
Parts required:
- battery powered component
- 220 ohm resistor
- 4N35 optocoupler
created 18 Sep 2012
by Scott Fitzgerald
https://store.arduino.cc/genuino-starter-kit
This example code is part of the public domain.
*/
const int optoPin = 2; // the pin the optocoupler is connected to
void setup() {
// make the pin with the optocoupler an output
pinMode(optoPin, OUTPUT);
}
void loop() {
digitalWrite(optoPin, HIGH); // pull pin 2 HIGH, activating the optocoupler
delay(15); // give the optocoupler a moment to activate
digitalWrite(optoPin, LOW); // pull pin 2 low until you're ready to activate again
delay(21000); // wait for 21 seconds
}
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